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Controls Tab
The two controls for this node are the Depth menu and the Dither menu. These two menus are used to
convert and adjust the color depth of the image.
Depth
The Keep setting doesn‘t do anything to the image but instead keeps the input depth. The other
options change the bit depth of the image to the respective value.
Dither
When down converting from a higher bit depth, it can be useful to add Error Diffusion or Additive
Noise to camouflage artifacts that result from problematic (high-contrast) areas.
Common Controls
Settings Tab
The Settings tab in the Inspector is also duplicated in other miscellaneous nodes. These common
controls are described in detail at the end of this chapter in “The Common Controls” section.
Custom Tool [CT]
The Custom Tool node
Custom Tool Node Introduction
The Custom Tool node is the most complex and the most powerful node in Fusion. It is used to create
custom expressions and filters to modify an image. In addition to providing three image inputs, the
Custom Tool node allows for the connection of up to eight numeric inputs and as many as four XY
position values from other controls and parameters in the node tree.
Per-pixel calculations can be performed on the Red, Green, Blue, Alpha, Z, Z-Coverage, UV texture
coords, XYZ Normals, RGBA background color, and XY motion vector channels of the images.
You should be moderately experienced with scripting, or C++ programming, to understand the
structure and terminology used by the Custom Tool node.
Inputs
The Custom Tool node has three image inputs, a matte input, and an effect mask input.
– Input: The orange, green, and magenta inputs combine 2D images to make your composite.
When entering them into the Custom Tool fields, they are referred to as c1, c2 and c3 (c
standard for all three R, G, B channels)
– Matte Input: The white input is for a matte created by polylines, basic primitive shapes, paint
strokes, or bitmaps from other tools. Connecting a matte to this input allows a matte to be
combined into any equation. When entering the matte into the Custom Tool fields, it is referred
to as m1.
– Effect Mask: The blue input is for a mask shape created by polylines, basic primitive shapes,
paint strokes, or bitmaps from other tools. Connecting a mask to this input limits the Custom
Tool effect to only those pixels within the mask.
Chapter 109Miscellaneous Nodes 2130
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